Circuit Description
The crankshaft position (CKP) sensor is a variable reluctance sensor. The CKP sensor signal indicates the crankshaft speed and position. The CKP sensor produces an AC voltage of different amplitude and frequency. The frequency depends on the velocity of the crankshaft, and the AC voltage output depends on the crankshaft position and battery voltage. The CKP sensor works in conjunction with a 58X reluctor wheel attached to the crankshaft. The CKP sensor is also used to detect misfire and for tachometer display. The CKP sensor connects directly to the powertrain control module (PCM) through the following circuits:
| • | The CKP sensor signal |
| • | The low reference |
If the PCM detects an incorrect number of pulses from the CKP sensor, DTC P0335 sets.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC P0335 Crankshaft Position (CKP) Sensor Circuit
Conditions for Running the DTC
| • | The engine is cranking or running. |
| • | A CMP sensor signal is present |
| • | DTC P0335 runs continuously once the above conditions are met. |
Conditions for Setting the DTC
| • | The PCM detects an incorrect number of CKP pulses during engine cranking for 4 seconds. |
| • | The PCM detects an incorrect number of CKP pulses while the engine is running for 2 seconds. |
Action Taken When the DTC Sets
| • | The control module illuminates the malfunction indicator lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails. |
| • | The control module records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the control module stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the control module records the operating conditions at the time of the failure. The control module writes the operating conditions to the Freeze Frame and updates the Failure Records. |
Conditions for Clearing the MIL/DTC
| • | The control module turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail. |
| • | A current DTC, Last Test Failed, clears when the diagnostic runs and passes. |
| • | A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic. |
| • | Clear the MIL and the DTC with a scan tool. |
Step | Action | Values | Yes | No | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
Schematic Reference: Engine Controls Schematics Connector End View Reference: Powertrain Control Module Connector End Views or Engine Controls Connector End Views | ||||||||||||
1 | Did you perform the Diagnostic System Check - Vehicle? | -- | Go to Step 2 | |||||||||
2 |
Does the Engine Speed parameter increment? | -- | Go to Step 3 | Go to Step 4 | ||||||||
3 |
Does the DTC fail this ignition? | -- | Go to Step 4 | Go to Intermittent Conditions | ||||||||
4 |
Is the resistance within the specified range? | 1,360-1,730 ohms | Go to Step 5 | Go to Step 6 | ||||||||
5 | Test the CKP sensor circuits for a short to voltage or a short to ground. Refer to Circuit Testing . Did you find and correct the condition? | -- | Go to Step 14 | Go to Step 9 | ||||||||
6 | Test the CKP sensor circuits for the following conditions:
Refer to Circuit Testing . Did you find and correct the condition? | -- | Go to Step 14 | Go to Step 7 | ||||||||
7 | Test for an intermittent and for a poor connection at the PCM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | -- | Go to Step 14 | Go to Step 8 | ||||||||
8 | Test for an intermittent and for a poor connection at the CKP sensor. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | -- | Go to Step 14 | Go to Step 10 | ||||||||
9 | Test for shorted terminals and poor connections at the PCM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs Did you find and correct the condition? | -- | Go to Step 14 | Go to Step 13 | ||||||||
10 |
Did you find and correct the conditions? | -- | Go to Step 14 | Go to Step 11 | ||||||||
11 | Visually inspect the CKP reluctor wheel for the following conditions:
Refer to Crankshaft and Bearing Cleaning and Inspection . Did you find and correct the condition? | -- | Go to Step 14 | Go to Step 12 | ||||||||
12 | Replace the CKP Sensor. Refer to Crankshaft Position Sensor Replacement . Did you complete the replacement? | -- | Go to Step 14 | -- | ||||||||
13 | Replace the PCM. Refer to Control Module References for replacement, setup, and programming. Did you complete the replacement? | -- | Go to Step 14 | -- | ||||||||
14 |
Did the DTC fail this ignition? | -- | Go to Step 2 | Go to Step 15 | ||||||||
15 | Observe the capture info with a scan tool. Are there any DTCs that have not been diagnosed? | -- | System OK | |||||||||
